The Russian fourth seed's 90-minute victory over the Czech eighth seed, a fellow Wimbledon champion, was a relief for five-time Miami finalist Sharapova, who had faced huge battle in her previous two victories.

The time, it was relatively straightforward for the crowd-pleaser as she bids for her first Miami crown.

"I started a bit slow in the first set," Sharapova said. "But I quickly got my energy and and started to take charge in the second set. I was playing swell by then, exactly as I wanted."

Four-time Grand Slam champion Sharapova broke four times as she was untroubled by Kvitova after the early stages, in which she lost the opening game but got the break back midway through the set.

The winner could have well set herself up for a re-run of the 2013 Miami final, in which she was beaten by Serena Williams.

Top seed Williams faced a quarter-final test later against German fifth seed Angelique Kerber.

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